<!DOCTYPE html>
<html lang="en">
<head>
	<meta charset="utf-8">
	<title>Welcome to CodeIgniter</title>

	<style type="text/css">  
		
		#body{font:12px arial;color:#000;background:#fff;margin:0}  
		
		#header{height:50px;color:#000;background:#fff;line-height:50px;margin-bottom:10px}  
		
		#content{width:100%;color:#000;float:right;margin-left:-240px}  

		#content_inner{height:400px;background:#fff;margin-left:240px}
		
		#side{width:230px;height:400px;color:#000;background:#fff;float:left}  
		
		#footer{height:50px;color:#000;background:#fff;margin-top:10px}  

		.clear{clear:both}
</style>  
	
</head>
<body>

<div id="header"> 的哦</div>
<div id="side"> 的哦</div>
<div id="content"> 
	<div id="content_inner">右侧</div>  
</div>

<div class="clear"> 的哦</div>
<div id="footer">的哦 </div>

</body>
</html>